wpf 绑定到元素
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wpf binding to element
提问by kaycee
Well i guess it's easy my scenario is having 2 elements: ListBoxand Button:
好吧，我想我的场景很容易有 2 个元素： ListBox和Button：
<ListBox Name="BannedItemsListBox"
Margin="5"
MinWidth="100"
MaxWidth="100" " Height="
204" ItemsSource="{Binding Path=BannedItems, Mode=TwoWay}"></ListBox>
<Button Name="RemoveBannedItemsButton"
Margin="5"
MinWidth="65"
Height="22"
Click="RemoveBannedItemButton_Click">Remove</Button>
I want to bind the IsEnabledproperty button to be true only if Item from ListBox is selected (focused) in XAML
IsEnabled仅当在XAML 中选择（聚焦）来自 ListBox 的项目时，我才想将属性按钮绑定为 true
I tried
我试过
IsEnabled="{Binding ElementName=BannedSourcesListBox, Path=TouchesDirectlyOver.Count}"
but no go.
但不行。
回答by H.B.
What does the selection have to do with the Touches? (Also the ElementNameis off)
选择与 Touches 有什么关系？（也ElementName关了）
I would try this:
我会试试这个：
IsEnabled="{Binding SelectedItems.Count, ElementName=BannedItemsListBox}"
Edit:Apparently, unlike the trigger-variant, people do not seem to see how this works: Basically the binding system tries to convert the input to the property at hand, a boolean, so when it gets an integer, 0will be converter to false, anything higher to true. So the Button will be enabled if one or more items are selected.
编辑：显然，与触发器变体不同，人们似乎没有看到它是如何工作的：基本上绑定系统试图将输入转换为手头的属性，一个布尔值，所以当它得到一个整数时，0将转换为false，任何更高的true。因此，如果选择了一项或多项，则 Button 将被启用。
回答by sternr
<Button Content="Button"
Height="23"
HorizontalAlignment="Left"
Margin="138,12,0,0"
Name="button1"
VerticalAlignment="Top"
Width="75"
Click="button1_Click">
<Button.Style>
<Style>
<Setter Property="Button.IsEnabled"
Value="True" />
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=lstTest , Path=SelectedItem}"
Value="{x:Null}">
<Setter Property="Button.IsEnabled"
Value="False" />
</DataTrigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
